docs: link user register to metadata for custom fields (#8117)

# Which Problems Are Solved

an admin wants to know how to register a new user with some custom
fields

# How the Problems Are Solved

We already had examples about user metadata and onboard new users, but
the link between those and how to use it was missing.

# Additional Context

Replace this example with links to related issues, discussions, discord
threads, or other sources with more context.
Use the Closing #issue syntax for issues that are resolved with this PR.
- Closes #7951

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>
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@ -12,6 +12,13 @@ sidebar_label: Username and Password
First, we create a new user with a username and password. In the example below we add a user with profile data, a verified email address, and a password.
[Create User Documentation](/apis/resources/user_service/user-service-add-human-user)
### Custom Fields
If you have custom fields you like to add to your users that are not provided by ZITADEL, you can add them to the metadata.
Metadata are key value pairs you can use for additional user data.
These fields can also be included in the token of the user, so you have access to it all the time.
Read more about the metadata [here](/docs/guides/manage/customize/user-metadata)
### Request
```bash

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@ -102,7 +102,7 @@ Please follow the configuration guides for the needed providers: [Let Users Logi
import OrgLoginDescription from "./_org_login_description.mdx";
<OrgLoginDescription name="OrgLodinDescription" />
<OrgLoginDescription name="OrgLoginDescription" />
### Build your own registration form
@ -117,8 +117,11 @@ We do have a guide series on how to build your own login ui, which also includes
You can find all the guides here: [Build your own login UI](/docs/guides/integrate/login-ui)
The create user request also allows you to add metadata (key, value) to the user.
#### Custom fields
The [create user request](/docs/apis/resources/user_service/user-service-add-human-user) also allows you to add [metadata](/docs/guides/manage/customize/user-metadata) (key, value) to the user.
This gives you the possibility to collect additional data from your users during the registration process and store it directly to the user in ZITADEL.
Those metadata can also directly be included in the [token](/docs/guides/manage/customize/user-metadata#use-tokens-to-get-user-metadata) of the user.
We recommend storing business relevant data in the database of your application, and only authentication and authorization relevant data in ZITADEL to follow the separation of concern pattern.
#### Registration with Organization External Identity Provider

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@ -219,6 +219,11 @@ An example response for your search looks like this:
}
```
## Register user with custom metadata
When you build your own registration UI you have the possibility to have custom fields and add them to the metadata of your user.
Learn everything about how to build your own registration UI [here](/docs/guides/integrate/onboarding/end-users#build-your-own-registration-form).
## Manage user metadata through the management API
The previous methods allowed you to retrieve metadata only for the `sub` in the access token.